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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Nautical Almanac sight reduction by calculation
From: Greg Rudzinski
Date: 2016 Feb 15, 12:44 -0800
From: Greg Rudzinski
Date: 2016 Feb 15, 12:44 -0800
Jim,
Algo: Hc = Arc Sin { Cos Dec Cos Lat Cos LHA +/- Sin Dec Sin Lat
Z = Arc Sin { Cos Dec Sin LHA / Cos Hc
The Ti - 36X Pro holds the functions in num-solve and op (see attached instruction book). This is a good value solar trig pocket calculator.
Greg Rudzinski
From: Jim Rives
Date: 2016 Feb 14, 20:31 -0800Thanks! What a fantastic sketch of the solution... Great little hand-done plotting sheet.
What is the algorithim you're using with your calculator, if I might ask?
Jim
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